CGH stands for Computer Generated Hologram. It is an optical lens that is used in interferometric measurement of complex surfaces, such as aspheric optics or freeform optics. CGH is designed using computer algorithms and then manufactured via optical lithography. The holographic interference fringes contained within the CGH element can generate an exact replica of the intended wavefront it is designed to test, thus serving as a reference for testing and measurement of complex optics.

Due to its wide application range, high precision in testing, and short production cycle, CGH is increasingly being used in aspheric mirror testing. 

One aspheric mirror corresponds to one CGH lens.

The specifications of aspheric mirror such as dimension, optical specifications and testing accuracy should be provided first, then we will make the customized design and manufacturing of CGH for it.

The test accuracy can reach 1/100λ for the normal aspheric mirror. 

Standard Sizes

D80mm*T8mm

D100mm*T10mm

D150mm*T15mm

D200mm*T20mm

User defined (Diameter*Thickness)

Application Surfaces

Cylindrical surfaces

aspheric surfaces,

freeform surfaces

optical systems

Cases

Null-corrector CGH for AI mirror testing learn more...

Interferometric testing of ULE mirror learn more...